Finding the Fourth Proportional to 10,443.72, 15,645.96 and 5,172.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,443.72 : 15,645.96 = 5,172.60 : x
2. Step 2: Convert to fraction form
   10,443.72/15,645.96 = 5,172.60/x
3. Step 3: Cross multiply
   10,443.72x = 15,645.96 × 5,172.60
4. Step 4: Simplify right side
   10,443.72x = 80,930,292.70
5. Step 5: Solve for x
   x = 80,930,292.70/10,443.72
6. Step 6: Final answer
   x = 7,749.18